The appointment of Unai Emery at Arsenal may come as a bit of shock to some, and while some may balk at the decision to go with the former Sevilla manager, Emery may be a better fit for the north London club than many expect.

The Spaniard was reportedly the unanimous managerial choice by the Arsenal board, with Ivan Gazidis massively impressed by Emery's trophy-laden spells at Sevilla and Paris Saint-Germain, but also by his willingness to work under the new management structure that Arsenal have implemented - headed up by former Borussia Dortmund head of recruitment Sven Mislintat and former Barcelona director of football Raul Sanllehi.

But it begs the question that if Arsenal's board were so impressed by Emery, why did his time at PSG not work out as many predicted it could have and possibly should have, with greater Champions League success?

The answer is multi-faceted, but Emery was replaced earlier this week in the French capital by former Borussia Dortmund manager Thomas Tuchel for a variety of essential reasons that were out of his control, in addition to certain of his own flaws, ultimately leading to the Spaniard being destined to depart Paris.

Unai Emery during his time as PSG manager. (Image: CHARLY TRIBALLEAU/AFP/Getty Images)

Emery is very comfortable in working at clubs with clearly defined hierarchical structures. For example, he enjoyed a successful time at Sevilla alongside the now much acclaimed sporting director Monchi - now of Roma - where the latter would buy untapped or underused talent from across Europe and the former would coach them in intense fashion, with now infamous USB sticks a primary tool, to improve their individual abilities on the training ground.

When appointing Emery off of the back of his third consecutive Europa League triumph in 2016, PSG tried to replicate this structure and strategy, employing former Barcelona and Ajax striker Patrick Kluivert as sporting director.

This move only lasted a season as Emery felt PSG President Nasser Al-Khelaifi needed to remove Kluivert - who had precious little prior experience in the role but was a friend of the club - with a more experienced hand. Antero Henrique eventually elected and the Portuguese played an important role in the signing of Neymar.

The unrest relating to the sporting director situation and even Emery's job - which was under threat just six months into his tenure - meant that the working conditions at PSG rapidly descended into being hostile. Of course, there is immense pressure at a club like Paris Saint-Germain to produce results, but Les Parisiens' hierarchy were already judging Emery before they has stabilised their new management structure.

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It is clear that historically, Emery requires time and patience from any board to implement his style, the language barrier and the more intense training regimes in comparison with Wenger's will certainly contribute to this reality at Arsenal. Arsenal - and, in particular, Mislintat - will have to replicate Emery's first summer transfer window at PSG when he signed Thomas Meunier. Costing just €6m from Club Brugge, Emery turned an individual with enormous potential and the desire to succeed into frankly a world class talent.

There's no point in splashing cash at proven players, Emery's core strengths lie in improving misused players or those with untapped potential. As his rocky relationship with Neymar and his failure to resolve the penalty-gate incident between the Brazilian and Edinson Cavani this season proves, Emery has struggled to bend confident, world-class players to his will.

Unai Emery on the training pitch at PSG

Mislintat's similarities with Monchi, in terms of experience in the role, and their shared penchant for nabbing France-based/originated talent, should excite Arsenal in terms of getting the best out of Emery.

Players like Steven N'Zonzi, Iago Aspas, Grzegorz Krychowiak, Ever Banega and Mariano were all bought by Monchi for under €10m and improved drastically thanks to the meticulous training methods of Emery. The likes of Joaquin and Jose Antonio Reyes have praised Emery for his incredible training ground methods, with the former claiming that the Basque-born manager was the best he had ever worked under.

Emery is not absolved from responsibility for PSG's Champions League and, in his first campaign, league failures. Without mentioning that infamous night in the Nou Camp, there were a lot of generally poor performances from PSG throughout the 2016/17 season, mainly in away fixtures at Monaco early in the campaign, but also in Toulouse and at Guingamp.

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The manner in which PSG lost these fixtures harked back to Emery's failure in his final Sevilla season to win a single league game away from home. The players did not appear focused, they were outfought and the old argument of the key players not being mentally strong enough when put under pressure, either in big matches or in games that required enormous focus against obviously weaker opposition, reared its ugly head again.

While these were counter-balanced by some impressive displays against Arsenal and during the first leg of the Champions League tie against Barcelona, they were all undone by that match in the Nou Camp which, rightly or wrongly, stands as the defining fixture of Emery's time in Paris.

It became an enduring measuring stick due to the nature of the capitulation and embarrassing manner of the defeat. Emery won seven trophies at PSG in two seasons, but his losses against Barcelona and Real Madrid in the Champions League are all people will unfortunately remember.

Arsenal should not set the bar too high for Emery immediately. While this sounds rather unambitious, it makes more sense than trying to chase competitions that realistically they are not geared up to win.

If Emery is to stay long-term, and Arsenal are serious about overhauling their squad's mental frailties, then they should avoid the mistakes that rivals Tottenham made in terms of attempting to compete for the Premier League and Champions League titles with a squad that lacks a winning mentality and the size to compete on two fronts.

Instead, the Gunners should focus on getting a few cup wins under their belt and building a winning mentality, the sort that Emery had during the Europa League campaigns at Sevilla, which resulted in three successive titles.

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It became apparent in the latter period of Emery's PSG managerial spell that the Spaniard's methods were incompatible with certain players, with Neymar not entirely on board with Emery's style of watching clips for hours in order to learn new facets of each individual squad member's game and how as a unit the team could function more effectively.

The clear implementation of a new, strong structure at Arsenal is promising, but they must provide Emery with a sufficient amount of time to transform this squad into producing consistent performances.

They must avoid the short-termism errors made at PSG and Manchester United, and build something for the long-run without the immediate guarantee of success. If these conditions produce themselves, then Unai Emery can genuinely bring Arsenal back to their glorious best.